/
checksum.go
39 lines (33 loc) · 1017 Bytes
/
checksum.go
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// Copyright 2023 RisingWave Labs
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package utils
import (
"hash/crc32"
"io"
)
type ChecksumWriter struct {
checksum uint32
w io.Writer
}
func (w *ChecksumWriter) Checksum() uint32 {
return w.checksum
}
func (w *ChecksumWriter) Write(p []byte) (n int, err error) {
n, err = w.w.Write(p)
w.checksum = crc32.Update(w.checksum, crc32.IEEETable, p[:n])
return
}
func NewChecksumWriter(w io.Writer) *ChecksumWriter {
return &ChecksumWriter{w: w}
}